ci: migrate GitHub Actions to Blacksmith runners

Author: hassiebp

.github/workflows/ci.yml

@@ -16,7 +16,7 @@ concurrency:
 
 jobs:
   linting:
-    runs-on: ubuntu-latest
+    runs-on: blacksmith-4vcpu-ubuntu-2404
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
       - name: Install uv and set Python version
@@ -31,7 +31,7 @@ jobs:
         run: uv run --frozen ruff check .
 
   type-checking:
-    runs-on: ubuntu-latest
+    runs-on: blacksmith-4vcpu-ubuntu-2404
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
       - name: Install uv and set Python version
@@ -53,7 +53,7 @@ jobs:
         run: uv run --frozen mypy langfuse --no-error-summary
 
   unit-tests:
-    runs-on: ubuntu-latest
+    runs-on: blacksmith-4vcpu-ubuntu-2404
     timeout-minutes: 30
     env:
       LANGFUSE_BASE_URL: "http://localhost:3000"
@@ -92,7 +92,7 @@ jobs:
           uv run --frozen pytest -n auto --dist worksteal -s -v --log-cli-level=INFO tests/unit
 
   e2e-tests:
-    runs-on: ubuntu-latest
+    runs-on: blacksmith-4vcpu-ubuntu-2404
     timeout-minutes: 30
     strategy:
       fail-fast: false
@@ -240,7 +240,7 @@ jobs:
 
   all-tests-passed:
     # This allows us to have a branch protection rule for tests and deploys with matrix
-    runs-on: ubuntu-latest
+    runs-on: blacksmith-4vcpu-ubuntu-2404
     needs: [unit-tests, e2e-tests, linting, type-checking]
     if: always()
     steps:

AGENTS.md

@@ -92,6 +92,7 @@ uv run --frozen pytest tests/unit/test_resource_manager.py::test_pause_signals_s
 
 The main CI workflow currently runs:
 
+- on Blacksmith Ubuntu 24.04 runners
 - linting on Python 3.13
 - mypy on Python 3.13
 - `tests/unit` on a Python 3.10-3.14 matrix